Ask Mr. Smarty Plants

Because we could not find Yucca rostrata in our Native Plant Database, we hunted by that name on the Internet and found this from San Marcos (Texas) Growers. Several other references mentioned this as native to Texas, which ordinarily would mean that it would be in our Native Plant Database.

All of which is neither here nor there, because the Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants, in Austin TX, is committed to the growth, protection and propagation of plants native not only to North America but to the area in which those plants are being grown. The administrators of our database are usually very careful that no non-native plants get into the database, so we can't even send you our plant information on your plant. What we can tell you for sure, is that there is NO yucca native to England. Yuccas are desert plants, used to growing in harsh, alkaline soils in blazing sun with little rain. If yours fell over, it may have been more as a result of surprise at being in such a lush, rainy climate than that of high winds.

Since it doesn't appear to be native to North America, and we know it's not native to England, the best we can do is refer you to the link to a Central Texas grower (San Marcos (Texas) Growers) that we gave you above. They have a very good article on the care of the plant.  We will say that if the stalk broken was a flowering stalk, no, it will not grow back, but neither will the plant die, as happens when the flowering stalks of some agaves are broken or cut off. We suggest you trim off the broken stalk and give the plant a chance to decide if it is going to live or die. And if it recovers, it will put up more bloom stalks.

Also, since we obviously cannot help you, we found a Q&A on yuccas in England from BBC Lancashire. From a company called Tropical Britain, we found this order form for Yucca rostrata, so you know we believe you when you say you have one, we just don't know how to answer your question.